package com.itheima.reggie.controller;

import com.aliyun.oss.OSSClient;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.net.URL;
import java.security.SecureRandom;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

@Controller
@RequestMapping("/common")
@Slf4j
@ResponseBody
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    //文件上传
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info(file.toString());
       /* SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        String endpoint = "http://oss-cn-nanjing.aliyuncs.com";
        String accessKeyId = "LTAI5t9P4Ak7wF4vQtxpf5fc";
        String accessKeySecret = "eByMaXscIiIlojEpwGM2I3qRczTScu";
        String bucketName = "wululu001";
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        //截取文件名后缀
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;

        String objectName = sdf.format(new Date()) + "/" + fileName;
        File file1 = new File(originalFilename);
        OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);

        ossClient.putObject(bucketName, objectName, file1);
        // 设置URL过期时间为1小时。
        Date expiration = new Date(System.currentTimeMillis() + 3600 * 1000);
        // 生成以GET方法访问的签名URL，访客可以直接通过浏览器访问相关内容。
        URL url = ossClient.generatePresignedUrl(bucketName, objectName, expiration);
        ossClient.shutdown();
        return R.success("1");*/


        //原始文件名
        String originalFilename = file.getOriginalFilename();
        //截取文件名后缀
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString()+ suffix;

        //创建一个目录对象
        File dir = new File(basePath);
        if (!dir.exists()){
            dir.mkdirs();
        }

        //将临时文件转存到指定位置
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return R.success(fileName);
    }

    //文件下载
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + File.separator + name));

            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
